docs: async def wait_until_leader(cls, node_id):
          """Await this function if you want to do nothing until node_id becomes a leader"""
          if node_id is None:
              raise ValueError('Node id can not be None!')
  
          if cls.get_leader() != node_id:
              cls.wait_until_leader_id = node_id
              cls.wait_until_leader_future = asyncio.Future(loop=cls.loop)
              await cls.wait_until_leader_future
  
              cls.wait_until_leader_id = None
              cls.wait_until_leader_future = None